duffield



2 Sheets-Sheet 1.

(No Model.)

' W. DUFPIELD.

LAMP.

Y No. 340,704. Patented Apr. 27, 1886.

WWTNEEEIEE N4 PETERS. Phmwljkhogmphcr. wmmn mn. n.1,.

2 Sheets-Sheet 2.

(No Model.)

W. DUFPIELDQ LAMP.

No. 340,704. Patented Apr. 27, 1886.

INVENTDR JU WM W, 2;,

a Qvwr-v WITNESSES VZVZM N. PETERS Pnclo-hlhognpher. Wzlhingtnn. D C.

UNITED STATES PATENT OFFICE.

XVILLIAM DUFFIELD, OF LONDON, ONTARIO, CANADA.

LAMP.

SPECIFICATION forming part oi Letters Patent No. 340,704, dated April 27, 1886.

Application filed September 14, 1885. Serial No.177,058. (N0 model.)

T 0 all whom it may concern.-

Be it known that l, \VILLIAM DUFFIELD, a subject of the Queen of Great Britain, residing at London, in the connty'ot' Middlesex and Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in OilLamp Burners; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention relates to lamps having a circular-flame burner; and it consists of an attachment by which the air from below is fed to the center of the flame in a highly-heated condition, so as to produce an intense white light.

In the accompanying drawings of my inven tion, Figure l is a side view of the air-distributing attachment. Figs. 2 and 3show the inner wires and central rod. Fig. 4 is a horizontal sect-ion of any portion of coil and wires. Fig. 5 is an elevation of a lamp, partly shown in section, with the air-distributer placed in the burner.

A is a stout wire coil, the bottom of which rests in the inner tube of the burner, and the sides and top of which rise above the wick. The sides of this coil are supported internally by two or more wires, B, which are attached on top to the button 0, which closes the top of coil.

D is a central wire, (not shown in Fig. 2,)

also attached at top to the under side of button and passing through center of coil and outat the bot-tom, where its end passes through a narrow bar, E. F is a nut screwing onto the threaded end of this central wire, and by means of this nut the bar E may be raised or lowered, so as to compress or expand the coil- A vertically, and by this means to regulate the volume of air passing out through coil to the flame. This may be effected in another way. The lower ends of wires B may be bent up and hooked over the bottom spiral of the coil, and on the button 0 being turned around these bent ends are wound up the spiral, and so tighten or relax it. In this case the nut F is not required to be moved.

In no case will the spirals of coil be quite closed against the passing out of the air to the flame, and this inner air, coming in contact with the heated wire ot'the coil in passing through to the outside, becomes heated, and is fed to the flame in a highly-heated state, so as to produce an intense white light.

The separate round wires of the coil warm the air much more thoroughly than a pert'orated surface of thin metal would do, on the principle of the tubular boilers, every portion of the air being brought in contact with the heated surface of wires before passing to the flame.

Having .thus described my inventiomwhat I claim as new is- 1. In a circular-flame burner, the wire coil A, for heating the air in its passage upward and outward to the flame, said coil being supported and adjusted by the rods D and B, the button or cap 0, and plate E, substantially as shown, and for the purpose set forth.

2. In combination with the coil'A, the button or cap 0, the wires B D, bar E, and nut F, for supporting and regulating said coil, substantially as shown and specified.

WILLIAM DUFFIELD. n s.]

Witnesses:

HENRY BEECH, A. J. B. 1\IAODONALD. 

